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In other words, around half of those Android devices did not receive a security update over the course of a year.
Google says more than 735 million Android devices received at least one security update in 2016.
The majority of Android users are still on Lollipop or Marshmallow, and even Android 4.4 KitKat and Android 4.x Jelly Bean have a larger user base than Android 7.0 Nougat.
That sounds pretty good… until you realize there are more than 1.4 billion active Android devices in the wild.
That’s despite Google’s relatively recent decision to start pushing out monthly security updates for Android.

Google began releasing monthly Android security patches in late 2015

Google began releasing monthly Android security patches in late 2015 after the discovery of the Stagefright vulnerability.
Skycure found that 71% of Android devices are running on security patches that are at least two months old — too old to be considered secure.
Skycure’s analysis allowed the company to analyze Android devices in January 2017 to determine the age of the security patches that were loaded on phones.
Nearly three-quarters of Android devices on the five biggest U.S. carriers are running on security patches that are at least two months old, putting them at greater risk of being hacked.
That figure is also in line with a Google security report stating that half of all Android devices had not received a security update in the past year.